In the early 1950s, the CIA created Project ARTICHOKE with the purpose of finding out if humans can involuntarily attempt assassinations via mind control. Basically, they used drugs and brainwashing and hypnosis as ways to fulfill one fascinating but messed-up objective: "Can we get control of an individual to the point where he will do our bidding against his will and even against fundamental laws of nature, such as self-preservation?"
he didn't terrorize the world, he only killed in California.